Figure 5. Framework of power dispatching data network
Figure 6 illustrates the classification and data flow direction of
electric power dispatching services. Among them, the services carried on
dispatch data network are mainly divided into control area services and
non-control area services. Typical control area services include
electric power monitoring system and management of safety device,
five-protection device, relay protection device, phasor measurement unit
(PMU), etc. The data transmission time delay requirement for such
control area services is at millisecond or second level, using real-time
subnets or dedicated channels of data transmission. Typical non-control
area services include online status monitoring, auxiliary monitoring
system, the management of electricity metering terminal and fault
waveform recorder, etc. The time delay requirement of such services is
at minute or hour level, using non-real-time subnets of data
transmission.